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US8181333B2 - Method of manufacturing squirrel-cage rotor - Google Patents

Method of manufacturing squirrel-cage rotor Download PDF

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Publication number
US8181333B2
US8181333B2 US12/407,210 US40721009A US8181333B2 US 8181333 B2 US8181333 B2 US 8181333B2 US 40721009 A US40721009 A US 40721009A US 8181333 B2 US8181333 B2 US 8181333B2
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US
United States
Prior art keywords
rotor
rotor bars
laminated stack
end rings
squirrel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US12/407,210
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US20100007234A1 (en
Inventor
Timothy J. Alfermann
Arthur L. McGrew, JR.
Ahmed M. El-Antably
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EL-ANTABLY, AHMED M., ALFERMANN, TIMOTHY J., MCGREW, ARTHUR L., JR.
Priority to US12/407,210 priority Critical patent/US8181333B2/en
Priority to DE102009031345A priority patent/DE102009031345A1/en
Priority to CN2009101402222A priority patent/CN101626179B/en
Assigned to UNITED STATES DEPARTMENT OF THE TREASURY reassignment UNITED STATES DEPARTMENT OF THE TREASURY SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Assigned to UAW RETIREE MEDICAL BENEFITS TRUST reassignment UAW RETIREE MEDICAL BENEFITS TRUST SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Publication of US20100007234A1 publication Critical patent/US20100007234A1/en
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: UNITED STATES DEPARTMENT OF THE TREASURY
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: UAW RETIREE MEDICAL BENEFITS TRUST
Assigned to WILMINGTON TRUST COMPANY reassignment WILMINGTON TRUST COMPANY SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Assigned to GM Global Technology Operations LLC reassignment GM Global Technology Operations LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/021—Magnetic cores
    • H02K15/023—Cage rotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0054—Casting in, on, or around objects which form part of the product rotors, stators for electrical motors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49012—Rotor

Definitions

  • the present disclosure relates to electric induction machines, and more particularly to methods of manufacturing squirrel-cage rotors for electric motors.
  • Squirrel-cage rotors for electric induction machines may include a laminated stack that defines a plurality of elongated slots. A plurality of rotor bars are provided in the elongated slots. A pair of end rings are provided at opposite ends of the laminated stack.
  • the laminated stack is placed in a set of molds that define cavities for forming the end rings. The cavities communicate with the elongated slots. A casting material is injected into the set of molds and fills in the cavities to form the end rings and the elongated slots to form the rotor bars.
  • die-casting the rotor bars and the end rings concurrently in the same set of molds increases the complexity of the molding process.
  • shrinkage holes may be formed in the interior of the elongated slots and the end rings. The shrinkage holes affect integrity of the rotor bars and the end rings. Further, die-casting the rotor bars and the end rings in the same set of molds is more expensive and die wear generally occurs when the die-cast rotor assembly is removed from the molds.
  • a method of manufacturing a squirrel-cage rotor includes: providing a laminated stack; attaching a plurality of rotor bars to the laminated stack, wherein the plurality of rotor bars each include opposite longitudinal ends; and die-casting a pair of end rings at the longitudinal ends of the plurality of rotor bars.
  • a squirrel-cage rotor includes a laminated stack, a plurality of rotor bars, and a pair of end rings.
  • the plurality of rotor bars are attached to the laminated stack and are made of a first material.
  • the pair of end rings are attached to longitudinal ends of the laminated stack and are made of a second material.
  • the second material is a casting material.
  • the first material is different from the second material.
  • the laminated stack includes a plurality of steel sheets.
  • the plurality of rotor bars are extruded and include aluminum alloy 6101.
  • the end rings are produced by die-casting aluminum alloy 6061.
  • FIG. 1 is a plan view of a squirrel-cage rotor in accordance with the teachings of the present disclosure
  • FIG. 2 is a cross-sectional view of a squirrel-cage rotor in accordance with the teachings of the present disclosure
  • FIG. 3 is a perspective view of a laminated stack of a squirrel-cage rotor in accordance with the teachings of the present disclosure
  • FIG. 4 is a top view of a metal sheet of a squirrel-cage rotor in accordance with the teachings of the present disclosure
  • FIG. 5 is a top view of a variant of a metal sheet of a squirrel-cage rotor in accordance with the teachings of the present disclosure.
  • FIG. 6 is a flow diagram illustrating a method of manufacturing a squirrel-cage rotor in accordance with the teachings of the present disclosure.
  • a method of manufacturing a squirrel-cage rotor in accordance with the teachings of the present disclosure includes inserting a plurality of preformed rotor bars to a laminated stack, followed by die-casting the end rings.
  • the rotor bars and the end rings are manufactured by different manufacturing methods, resulting in increased selection of available materials and reduced molding expenses.
  • an exemplary squirrel-cage rotor 10 for an electric induction machine includes a laminated stack 14 , a plurality of rotor bars 16 inserted into the laminated stack 14 , and a pair of end rings 18 provided at longitudinal ends of the laminated stack 14 .
  • the laminated stack 14 may be mounted around a rotatable shaft 21 .
  • the rotor bars 16 include longitudinal ends 20 that protrude beyond the longitudinal ends of the laminated stack 14 and that are inserted into the end rings 18 .
  • the laminated stack 14 abuts against the end rings 18 .
  • Weld joints 22 are formed at interfaces between the rotor bars 16 and the end rings 18 .
  • the weld joints 22 may be formed at peripheries of the rotor bars 16 adjacent to the end rings 18 and along the entire surfaces of the rotor bars 16 inside the end rings 18 .
  • the laminated stack 14 includes a central slot 26 and a plurality of elongated slots 28 .
  • the rotatable shaft 21 may be inserted into the central slot 26 .
  • the elongated slots 28 are provided adjacent to the periphery of the laminated stack 14 and may extend axially along the entire length of the laminated stack 28 .
  • the elongated slots 28 may extend in a direction parallel to a central axis of the laminated stack 14 .
  • the elongated slots 28 may be skewed relative to the end rings 18 .
  • the plurality of rotor bars 16 are inserted into the elongated slots 28 .
  • the laminated stack 14 includes a plurality of metal sheets 24 that are made of, for example only, steel.
  • the plurality of metal sheets 24 are laminated along the central axis of the laminated stack 14 and each have a central opening 30 and a plurality of peripheral apertures 32 .
  • the central openings 30 of the plurality of metal sheets 24 jointly define the central slot 26 for the rotatable shaft 21 .
  • the plurality of apertures 32 are circumferentially spaced apart and jointly define the elongated slots 28 .
  • the peripheral apertures 32 may have a shape and size conforming to the shape and size of the rotor bars 16 .
  • a variant form of a metal sheet 40 may include a central opening 42 and a plurality of cutouts 44 that are open to the peripheral edges. It is noted that the apertures 32 and the cutouts 44 of FIGS. 4 and 5 , respectively, are shown for illustration only and the number of the apertures 28 and the cutouts 44 may not be consistent with the number elongated slots illustrated in FIG. 3 .
  • the rotor bars 16 and the end rings are formed with electrically conductive materials.
  • the rotor bars 16 and the end rings 18 may include, for example only, copper alloy or aluminum alloy.
  • the rotor bars 16 may be formed, for example only, by extrusion, stamping or machining.
  • the end rings 28 may be formed, for example only, by die casting.
  • the rotor bars 16 may be produced in extruded rods made of aluminum alloy 6101 and the end rings may be produced by die-casting aluminum alloy 6061.
  • Aluminum alloy 6101 has greater electrical conductivity than aluminum alloy 6061, whereas aluminum alloy 6061 has greater mechanical strength than aluminum alloy 6101.
  • a method 70 of manufacturing a squirrel-cage rotor starts in step 72 .
  • a plurality of metal sheets are laminated to form a laminated stack in step 74 .
  • the central openings of the metal sheets are aligned to form a central slot for the rotatable shaft.
  • the peripheral apertures are aligned to form a plurality of bar slots.
  • a plurality of rotor bars are pre-formed, for example only, by extrusion in step 76 .
  • the preformed rotor bars are inserted into the bar slots to form a sub-assembly in step 78 .
  • the longitudinal ends of the rotor bars protrude from the longitudinal ends of the laminated stack.
  • the sub-assembly is placed in a set of die cast molds that define cavities for forming end rings in step 80 .
  • a molten casting material is injected into the die cast molds to fill in the cavities in step 82 .
  • the end rings are formed and may be partially joined to the rotor bars 16 .
  • the rotor assembly that includes the rotor core 14 , the rotor bars 16 , and the end rings 18 is removed from the molds in step 84 .
  • Stir-welding is applied to the interfaces between the rotor bars 16 and the end rings 18 in step 86 .
  • a welding fixture (not shown) may be used to retain the end rings 18 in position relative to the longitudinal ends 20 of the rotor bars 16 .
  • the rotor bars 16 are placed perpendicular to the end rings 18 and are inserted into the end rings 18 .
  • Stir welding is a solid-state joining process wherein frictional heat is generated to cause opposed portions of workpieces to take up a plasticized condition. When a spinning probe that causes the frictional heat is removed, the plasticized portions solidify and join the workpieces.
  • the weld joints 22 may be formed by stir-welding and may be formed at the interface between the rotor bars 16 and the end rings 18 . For example only, the weld joints 22 may be formed around the circumference of the end rings 18 and/or peripheries of the rotor bars 16 .
  • the end rings 18 are later machined to provide smooth weld joints in step 88 . If the end rings 18 have an outside diameter greater than that of the laminated stack 14 , the end rings 18 may be machined to have an outside diameter approximate to the outside diameter of the laminated stack.
  • the method 70 ends in the step 90 .
  • the squirrel-cage rotor manufactured by the method of the present disclosure has preformed rotor bars and die-cast end rings.
  • the rotor bars may be made of a material that has a greater electrical conductivity than that of the end rings. Therefore, the method of manufacturing a squirrel-cage rotor according to the present disclosure allows for wide selection of materials while increasing integrity of the rotor bars and the end rings.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Induction Machinery (AREA)

Abstract

A method of manufacturing a squirrel-cage rotor includes: providing a laminated stack; attaching a plurality of rotor bars to the laminated stack, wherein the plurality of rotor bars each include opposite longitudinal ends; and die-casting a pair of end rings at the longitudinal ends of the plurality of rotor bars.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of U.S. Provisional Application No. 61/079,192, filed on Jul. 9, 2008. The disclosure of the above application is incorporated herein by reference.
FIELD
The present disclosure relates to electric induction machines, and more particularly to methods of manufacturing squirrel-cage rotors for electric motors.
BACKGROUND
The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.
Squirrel-cage rotors for electric induction machines may include a laminated stack that defines a plurality of elongated slots. A plurality of rotor bars are provided in the elongated slots. A pair of end rings are provided at opposite ends of the laminated stack. To manufacture the squirrel-cage rotor, the laminated stack is placed in a set of molds that define cavities for forming the end rings. The cavities communicate with the elongated slots. A casting material is injected into the set of molds and fills in the cavities to form the end rings and the elongated slots to form the rotor bars.
Die-casting the rotor bars and the end rings concurrently in the same set of molds increases the complexity of the molding process. For example, shrinkage holes may be formed in the interior of the elongated slots and the end rings. The shrinkage holes affect integrity of the rotor bars and the end rings. Further, die-casting the rotor bars and the end rings in the same set of molds is more expensive and die wear generally occurs when the die-cast rotor assembly is removed from the molds.
SUMMARY
Accordingly, a method of manufacturing a squirrel-cage rotor includes: providing a laminated stack; attaching a plurality of rotor bars to the laminated stack, wherein the plurality of rotor bars each include opposite longitudinal ends; and die-casting a pair of end rings at the longitudinal ends of the plurality of rotor bars.
A squirrel-cage rotor includes a laminated stack, a plurality of rotor bars, and a pair of end rings. The plurality of rotor bars are attached to the laminated stack and are made of a first material. The pair of end rings are attached to longitudinal ends of the laminated stack and are made of a second material. The second material is a casting material. The first material is different from the second material.
In other features, the laminated stack includes a plurality of steel sheets. The plurality of rotor bars are extruded and include aluminum alloy 6101. The end rings are produced by die-casting aluminum alloy 6061.
Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
DRAWINGS
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
FIG. 1 is a plan view of a squirrel-cage rotor in accordance with the teachings of the present disclosure;
FIG. 2 is a cross-sectional view of a squirrel-cage rotor in accordance with the teachings of the present disclosure;
FIG. 3 is a perspective view of a laminated stack of a squirrel-cage rotor in accordance with the teachings of the present disclosure;
FIG. 4 is a top view of a metal sheet of a squirrel-cage rotor in accordance with the teachings of the present disclosure;
FIG. 5 is a top view of a variant of a metal sheet of a squirrel-cage rotor in accordance with the teachings of the present disclosure; and
FIG. 6 is a flow diagram illustrating a method of manufacturing a squirrel-cage rotor in accordance with the teachings of the present disclosure.
 DETAILED DESCRIPTION
The following description of the preferred embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. For purposes of clarity, the same reference numbers will be used in the drawings to identify similar elements.
A method of manufacturing a squirrel-cage rotor in accordance with the teachings of the present disclosure includes inserting a plurality of preformed rotor bars to a laminated stack, followed by die-casting the end rings. The rotor bars and the end rings are manufactured by different manufacturing methods, resulting in increased selection of available materials and reduced molding expenses.
Referring now to FIGS. 1 and 2, an exemplary squirrel-cage rotor 10 for an electric induction machine includes a laminated stack 14, a plurality of rotor bars 16 inserted into the laminated stack 14, and a pair of end rings 18 provided at longitudinal ends of the laminated stack 14. The laminated stack 14 may be mounted around a rotatable shaft 21. The rotor bars 16 include longitudinal ends 20 that protrude beyond the longitudinal ends of the laminated stack 14 and that are inserted into the end rings 18. The laminated stack 14 abuts against the end rings 18. Weld joints 22 are formed at interfaces between the rotor bars 16 and the end rings 18. For example only, the weld joints 22 may be formed at peripheries of the rotor bars 16 adjacent to the end rings 18 and along the entire surfaces of the rotor bars 16 inside the end rings 18.
Referring to FIG. 3, the laminated stack 14 includes a central slot 26 and a plurality of elongated slots 28. The rotatable shaft 21 may be inserted into the central slot 26. The elongated slots 28 are provided adjacent to the periphery of the laminated stack 14 and may extend axially along the entire length of the laminated stack 28. The elongated slots 28 may extend in a direction parallel to a central axis of the laminated stack 14. Alternatively, the elongated slots 28 may be skewed relative to the end rings 18. The plurality of rotor bars 16 are inserted into the elongated slots 28.
Referring to FIG. 4, the laminated stack 14 includes a plurality of metal sheets 24 that are made of, for example only, steel. The plurality of metal sheets 24 are laminated along the central axis of the laminated stack 14 and each have a central opening 30 and a plurality of peripheral apertures 32. The central openings 30 of the plurality of metal sheets 24 jointly define the central slot 26 for the rotatable shaft 21. The plurality of apertures 32 are circumferentially spaced apart and jointly define the elongated slots 28. The peripheral apertures 32 may have a shape and size conforming to the shape and size of the rotor bars 16.
Referring to FIG. 5, a variant form of a metal sheet 40 may include a central opening 42 and a plurality of cutouts 44 that are open to the peripheral edges. It is noted that the apertures 32 and the cutouts 44 of FIGS. 4 and 5, respectively, are shown for illustration only and the number of the apertures 28 and the cutouts 44 may not be consistent with the number elongated slots illustrated in FIG. 3.
The rotor bars 16 and the end rings are formed with electrically conductive materials. The rotor bars 16 and the end rings 18 may include, for example only, copper alloy or aluminum alloy. The rotor bars 16 may be formed, for example only, by extrusion, stamping or machining. The end rings 28 may be formed, for example only, by die casting. For example only, the rotor bars 16 may be produced in extruded rods made of aluminum alloy 6101 and the end rings may be produced by die-casting aluminum alloy 6061. Aluminum alloy 6101 has greater electrical conductivity than aluminum alloy 6061, whereas aluminum alloy 6061 has greater mechanical strength than aluminum alloy 6101.
Referring to FIG. 6, a method 70 of manufacturing a squirrel-cage rotor starts in step 72. A plurality of metal sheets are laminated to form a laminated stack in step 74. The central openings of the metal sheets are aligned to form a central slot for the rotatable shaft. The peripheral apertures are aligned to form a plurality of bar slots. A plurality of rotor bars are pre-formed, for example only, by extrusion in step 76. The preformed rotor bars are inserted into the bar slots to form a sub-assembly in step 78. The longitudinal ends of the rotor bars protrude from the longitudinal ends of the laminated stack. The sub-assembly is placed in a set of die cast molds that define cavities for forming end rings in step 80. A molten casting material is injected into the die cast molds to fill in the cavities in step 82. When the molten material is solidified, the end rings are formed and may be partially joined to the rotor bars 16.
The rotor assembly that includes the rotor core 14, the rotor bars 16, and the end rings 18 is removed from the molds in step 84. Stir-welding is applied to the interfaces between the rotor bars 16 and the end rings 18 in step 86. During friction-stir-welding, a welding fixture (not shown) may be used to retain the end rings 18 in position relative to the longitudinal ends 20 of the rotor bars 16. The rotor bars 16 are placed perpendicular to the end rings 18 and are inserted into the end rings 18.
Stir welding is a solid-state joining process wherein frictional heat is generated to cause opposed portions of workpieces to take up a plasticized condition. When a spinning probe that causes the frictional heat is removed, the plasticized portions solidify and join the workpieces. The weld joints 22 may be formed by stir-welding and may be formed at the interface between the rotor bars 16 and the end rings 18. For example only, the weld joints 22 may be formed around the circumference of the end rings 18 and/or peripheries of the rotor bars 16. The end rings 18 are later machined to provide smooth weld joints in step 88. If the end rings 18 have an outside diameter greater than that of the laminated stack 14, the end rings 18 may be machined to have an outside diameter approximate to the outside diameter of the laminated stack. The method 70 ends in the step 90.
The squirrel-cage rotor manufactured by the method of the present disclosure has preformed rotor bars and die-cast end rings. According to the method of the present disclosure, the rotor bars may be made of a material that has a greater electrical conductivity than that of the end rings. Therefore, the method of manufacturing a squirrel-cage rotor according to the present disclosure allows for wide selection of materials while increasing integrity of the rotor bars and the end rings.
Those skilled in the art can now appreciate from the foregoing description that the broad teachings of the present disclosure can be implemented in a variety of forms. Therefore, while this disclosure has been described in connection with particular examples thereof, the true scope of the disclosure should not be so limited since other modifications will become apparent to the skilled practitioner upon a study of the drawings, the specification and the following claims.

Claims (1)

1. A method of manufacturing a squirrel-cage rotor of an electric motor, comprising:
laminating a plurality of steel sheets to form a laminated stack for the squirrel-cage rotor,
the laminated stack defining a plurality of elongated slots that are spaced circumferentially around the laminated stack;
forming a plurality of rotor bars for the squirrel-cage rotor from a first material by extrusion,
wherein the first material is aluminum alloy 6101;
attaching the plurality of rotor bars to the laminated stack,
wherein attaching the plurality of rotor bars to the laminated stack includes inserting the rotor bars into the plurality of elongated slots, respectively, and
wherein the plurality of rotor bars each include opposite longitudinal ends,
wherein the longitudinal ends of the rotor bars extend beyond longitudinal ends of the laminated stack;
placing the laminated stack and the plurality of rotor bars in a set of molds;
die-casting, using the set of molds, a pair of end rings for the squirrel-cage rotor from a second material at the longitudinal ends of the plurality of rotor bars,
wherein the first material is different from the second material,
and wherein the second material is aluminum alloy 6061;
stir welding the longitudinal ends of the rotor bars to the end rings,
the stir welding forming weld joints at interfaces between the rotor bars and the end rings; and
smoothing the weld joints formed by the stir welding.
US12/407,210 2008-07-09 2009-03-19 Method of manufacturing squirrel-cage rotor Expired - Fee Related US8181333B2 (en)

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US12/407,210 US8181333B2 (en) 2008-07-09 2009-03-19 Method of manufacturing squirrel-cage rotor
DE102009031345A DE102009031345A1 (en) 2008-07-09 2009-07-01 Squirrel cage and methods of making them
CN2009101402222A CN101626179B (en) 2008-07-09 2009-07-09 Squirrel-cage rotors and methods of manufacturing same

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US7919208P 2008-07-09 2008-07-09
US12/407,210 US8181333B2 (en) 2008-07-09 2009-03-19 Method of manufacturing squirrel-cage rotor

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US8181333B2 true US8181333B2 (en) 2012-05-22

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CN113556011B (en) * 2021-08-04 2022-05-24 永济市贝特电气机械有限公司 A method of making a motor rotor squirrel cage
DE102022212315B4 (en) 2022-11-18 2024-10-17 Zf Friedrichshafen Ag Method for producing a rotor of an electrical machine and rotor
DE102022212320B4 (en) 2022-11-18 2024-08-01 Zf Friedrichshafen Ag Method for producing a rotor of an electrical machine and rotor

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US20120210563A1 (en) * 2011-02-23 2012-08-23 GM Global Technology Operations LLC Method of manufacturing an end ring over pre-formed conductor bars of a rotor for an electric device
US8424188B2 (en) * 2011-02-23 2013-04-23 GM Global Technology Operations LLC Method of manufacturing an end ring over pre-formed conductor bars of a rotor for an electric device
EP3113340A4 (en) * 2014-02-28 2017-10-25 NHK Spring Co., Ltd. Rotor and method for manufacturing same
US10505432B2 (en) 2014-02-28 2019-12-10 Nhk Spring Co., Ltd. Rotor and method for manufacturing rotor

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